辯正論 6.73

6.73

外論曰。老君初誕之日既不同凡。晦迹之時固當殊世。所以西之流沙途經函谷。青牛出境紫氣浮天。不測始終莫知方域。釋迦抱危疾於舍衛。告殞命於雙林。燒柩焚屍還同胡法。氣盡神謝曾不異凡。此去世之異七也。

The External Argument says: Since the day Lord Lao was born was unlike that of mortals, the time of his concealing his traces was certainly different from that of the world. Thus, heading west to the shifting sands, his journey passed through the Hangu Pass; his green ox departed the frontier, and purple mist floated in the sky. Neither his beginning nor his end can be fathomed, and no one knows his whereabouts. Śākya suffered a grievous illness at Śrāvastī and announced his demise in the Twin Groves; burning the coffin and cremating the corpse was merely following barbarian customs. His breath ended and his spirit departed, not differing in the least from ordinary mortals. This is the seventh difference, regarding departure from the world.